Invalid API Response errors from unparsed tool calls
Coding agent shows Invalid API Response when a model puts tool calls in reasoning blocks or unusual formats.
Tier II · Emerging Problems that are still building up.
3 public reports · first reported 4 November 2025 · last reported 18 July 2026
What's going wrong
Users of Cline report that tasks stop with an Invalid API Response error saying the provider returned an empty or unparsable response.
AI-assisted: written with the help of AI from the reports. The idea report has the full summary.
In the idea report
- The full summary.
- The products the 3 reports are about, and how many came each month.
- Related problems.
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